Enhancement of minority carrier diffusion length in grains of cast Si by hydrogen heat treatments
Abstract
Minority carrier diffusion length (mcdl) enhancement in the bulk of grains of cast poly-silicon for solar cells has been produced by hydrogen heat treatments. Measurements made by LBIC method, showed an increase of mcdl in the bulk of grains from a mean value of 53 microns to a mean value of 69 microns, before and after the hydrogen heat treatments, respectively, under white light illumination. A mean increase ratio of 33% in the mcdl was obtained in a reproducible way and it was verified that hydrogen was effectively responsible. This result clearly establishes the hydrogen passivating role in this material
- Publication:
-
15th Photovoltaic Specialists Conference
- Pub Date:
- 1981
- Bibcode:
- 1981pvsp.conf..259M
- Keywords:
-
- Controlled Atmospheres;
- Electron Diffusion;
- Grain Boundaries;
- Heat Treatment;
- Minority Carriers;
- Silicon;
- Solar Cells;
- Castings;
- Diffusion Theory;
- Energy Technology;
- Hydrogen;
- Photovoltaic Conversion;
- Volt-Ampere Characteristics;
- Solid-State Physics